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Support _id aggregation operators for $group stage #3096

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merged 19 commits into from
Jul 26, 2023
Merged

Support _id aggregation operators for $group stage #3096

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Merge branch 'main' into aggregation-group-id-operators-2964
mergify[bot] Jul 26, 2023
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6 changes: 2 additions & 4 deletions integration/aggregate_documents_compat_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -618,25 +618,23 @@ func TestAggregateCompatGroup(t *testing.T) {
},
"IDType": {
pipeline: bson.A{bson.D{{"$group", bson.D{
{"_id", bson.D{{"$type", "_id"}}},
{"_id", bson.D{{"$type", "$v"}}},
{"count", bson.D{{"$count", bson.D{}}}},
}}}},
skip: "https://github.com/FerretDB/FerretDB/issues/2679",
},
"IDSum": {
pipeline: bson.A{
bson.D{{"$sort", bson.D{{"_id", 1}}}},
bson.D{{"$group", bson.D{{"_id", bson.D{{"$sum", "$v"}}}}}},
bson.D{{"$sort", bson.D{{"_id", 1}}}},
},
skip: "https://github.com/FerretDB/FerretDB/issues/2694",
},
"IDSumNonExistentField": {
pipeline: bson.A{
bson.D{{"$sort", bson.D{{"_id", 1}}}},
bson.D{{"$group", bson.D{{"_id", bson.D{{"$sum", "$non-existent"}}}}}},
bson.D{{"$sort", bson.D{{"_id", 1}}}},
},
skip: "https://github.com/FerretDB/FerretDB/issues/2694",
},
}

Expand Down
147 changes: 91 additions & 56 deletions internal/handlers/common/aggregations/stages/group.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,9 +18,11 @@ import (
"context"
"errors"
"fmt"
"time"

"github.com/FerretDB/FerretDB/internal/handlers/common"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations/operators"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations/operators/accumulators"
"github.com/FerretDB/FerretDB/internal/handlers/commonerrors"
"github.com/FerretDB/FerretDB/internal/types"
Expand Down Expand Up @@ -82,6 +84,10 @@ func newGroup(stage *types.Document) (aggregations.Stage, error) {

if field == "_id" {
if doc, ok := v.(*types.Document); ok {
if operators.IsOperator(doc) {
continue
}

if err = validateExpression("$group", doc); err != nil {
return nil, err
}
Expand Down Expand Up @@ -165,73 +171,102 @@ func (g *group) Process(ctx context.Context, iter types.DocumentsIterator, close

// groupDocuments groups documents by group expression.
func (g *group) groupDocuments(ctx context.Context, in []*types.Document) ([]groupedDocuments, error) {
groupKey, ok := g.groupExpression.(string)
if !ok {
// non-string key aggregates values of all `in` documents into one aggregated document.
return []groupedDocuments{{
groupID: g.groupExpression,
documents: in,
}}, nil
}
switch groupKey := g.groupExpression.(type) {
case *types.Document:
if !operators.IsOperator(groupKey) {
break
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}

expression, err := aggregations.NewExpression(groupKey)
if err != nil {
var exprErr *aggregations.ExpressionError
if !errors.As(err, &exprErr) {
return nil, lazyerrors.Error(err)
op, err := operators.NewOperator(groupKey)
if err != nil {
return nil, err
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}

switch exprErr.Code() {
case aggregations.ErrNotExpression:
// constant value aggregates values of all `in` documents into one aggregated document.
return []groupedDocuments{{
groupID: groupKey,
documents: in,
}}, nil
case aggregations.ErrEmptyFieldPath:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
// TODO
commonerrors.ErrGroupInvalidFieldPath,
"'$' by itself is not a valid Expression",
"$group (stage)",
)
case aggregations.ErrInvalidExpression:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFailedToParse,
fmt.Sprintf("'%s' starts with an invalid character for a user variable name", types.FormatAnyValue(groupKey)),
"$group (stage)",
)
case aggregations.ErrEmptyVariable:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFailedToParse,
"empty variable names are not allowed",
"$group (stage)",
)
// TODO https://github.com/FerretDB/FerretDB/issues/2275
case aggregations.ErrUndefinedVariable:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrGroupUndefinedVariable,
fmt.Sprintf("Use of undefined variable: %s", types.FormatAnyValue(groupKey)),
"$group (stage)",
)
default:
panic(fmt.Sprintf("unhandled field path error %s", exprErr.Error()))
var group groupMap

for _, doc := range in {
val, err := op.Process(doc)
if err != nil {
return nil, err
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}

group.addOrAppend(val, doc)
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}
}

var group groupMap
return group.docs, nil

for _, doc := range in {
val, err := expression.Evaluate(doc)
case *types.Array, float64, types.Binary, types.ObjectID, bool, time.Time, types.NullType,
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types.Regex, int32, types.Timestamp, int64:
// non-string or document key aggregates values of all `in` documents into one aggregated document.

case string:
expression, err := aggregations.NewExpression(groupKey)
if err != nil {
// $group treats non-existent fields as nulls
val = types.Null
var exprErr *aggregations.ExpressionError
if !errors.As(err, &exprErr) {
return nil, lazyerrors.Error(err)
}

switch exprErr.Code() {
case aggregations.ErrNotExpression:
// constant value aggregates values of all `in` documents into one aggregated document.
return []groupedDocuments{{
groupID: groupKey,
documents: in,
}}, nil
case aggregations.ErrEmptyFieldPath:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
// TODO
commonerrors.ErrGroupInvalidFieldPath,
"'$' by itself is not a valid Expression",
"$group (stage)",
)
case aggregations.ErrInvalidExpression:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFailedToParse,
fmt.Sprintf("'%s' starts with an invalid character for a user variable name", types.FormatAnyValue(groupKey)),
"$group (stage)",
)
case aggregations.ErrEmptyVariable:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFailedToParse,
"empty variable names are not allowed",
"$group (stage)",
)
// TODO https://github.com/FerretDB/FerretDB/issues/2275
case aggregations.ErrUndefinedVariable:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrGroupUndefinedVariable,
fmt.Sprintf("Use of undefined variable: %s", types.FormatAnyValue(groupKey)),
"$group (stage)",
)
default:
panic(fmt.Sprintf("unhandled field path error %s", exprErr.Error()))
}
}

group.addOrAppend(val, doc)
var group groupMap

for _, doc := range in {
val, err := expression.Evaluate(doc)
if err != nil {
// $group treats non-existent fields as nulls
val = types.Null
}

group.addOrAppend(val, doc)
}

return group.docs, nil

default:
panic(fmt.Sprintf("unexpected type %[1]T (%#[1]v)", groupKey))
}

return group.docs, nil
return []groupedDocuments{{
groupID: g.groupExpression,
documents: in,
}}, nil
}

// groupedDocuments contains group key and the documents for that group.
Expand Down